Al2O3包覆Li1.2Mn0.54Ni0.13Co0.13O2富锂正极材料的电化学性能

doi:10.11901/1005.3093.2019.579

材料研究学报

2020, Vol. 34

Issue (8): 621-627 DOI: 10.11901/1005.3093.2019.579

研究论文

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Al₂O₃包覆Li_1.2Mn_0.54Ni_0.13Co_0.13O₂富锂正极材料的电化学性能

左成, 杜云慧(

), 张鹏, 王玉洁, 曹海涛

北京交通大学机械与电子控制学院北京 100044

Electrochemical Performance of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ Lithium-enriched Cathode Materials Coated with Al₂O₃

ZUO Cheng, DU Yunhui(

), ZHANG Peng, WANG Yujie, Cao Haitao

School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

引用本文:

左成, 杜云慧, 张鹏, 王玉洁, 曹海涛. Al₂O₃包覆Li_1.2Mn_0.54Ni_0.13Co_0.13O₂富锂正极材料的电化学性能[J]. 材料研究学报, 2020, 34(8): 621-627.
Cheng ZUO, Yunhui DU, Peng ZHANG, Yujie WANG, Haitao Cao. Electrochemical Performance of Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ Lithium-enriched Cathode Materials Coated with Al₂O₃[J]. Chinese Journal of Materials Research, 2020, 34(8): 621-627.

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摘要:

用溶胶凝胶法制备了Li_1.2Mn_0.54Ni_0.13Co_0.13O₂富锂锰基正极材料，用均匀沉淀法对其进行不同比例Al₂O₃的表面包覆改性，并对其进行XRD、TEM表征和电化学性能分析。结果表明，包覆后的材料保持了原来的层状结构，Al₂O₃均匀地包覆在材料颗粒表面形成纳米级包覆层。在0.1C、2.0~4.8 V条件下Al₂O₃包覆量(质量分数)为0.7%的正极材料首次放电容量为251.3 mAh/g，首次库仑效率达到76.1%，100次循环后容量保持率达92.9%。包覆Al₂O₃抑制了循环过程中的电压衰减，适量的Al₂O₃包覆使正极材料的电化学性能提高。

关键词 ：无机非金属材料, Li_1.2Mn_0.54Ni_0.13Co_0.13O₂, 正极材料, Al₂O₃包覆, 电化学性能

Abstract：

Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ lithium-rich manganese-based cathode materials were prepared by sol-gel method, then coated with Al₂O₃ by uniform precipitation method, which further characterized by means of XRD, TEM and electrochemical properties analysis. Results show that the coated material still has the layered structure as its original status, Al₂O₃ was uniformly coated on the surface of the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ particles to form a nano-scale coating. The initial discharge capacity of the Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ powder coated with 0.7% Al₂O₃ was 251.3 mAh/g under the condition of 0.1 C and 2.0~4.8 V. The first coulombic efficiency is 76.1%, and the capacity retention rate is 92.9% after 100 cycles., and the coating also effectively suppresses the voltage decay during the cycle. The proper amount of Al₂O₃ coating can effectively improve the electrochemical performance of the cathode material.

Key words： inorganic non-metallic materials Li_1.2Mn_0.54Ni_0.13Co_0.13O₂ cathode material Al₂O₃ coating electrochemical performance

收稿日期: 2019-12-10

ZTFLH:

TM911

基金资助:北京市自然科学基金(2162036)

作者简介: 左成，男，1994年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.579 或 https://www.cjmr.org/CN/Y2020/V34/I8/621

图1 不同Al2O3包覆量Li1.2Mn0.54Ni0.13Co0.13O2的XRD谱图

表1 不同Al2O3包覆量的Li1.2Mn0.54Ni0.13Co0.13O2的晶胞参数

图2 Al2O3包覆前后样品的TEM照片

图3 不同Al2O3包覆量富锂正极材料的首次充放电曲线

表2 不同Al2O3包覆量富锂正极材料的首次充放电性能

图4 不同Al2O3包覆量富锂正极材料不同循环的放电曲线和中值电压曲线

图5 不同Al2O3包覆量富锂正极材料的循环性能

表3 不同Al2O3包覆量富锂正极材料的循环性能参数

图6 不同Al2O3包覆量富锂正极材料的EIS阻抗谱及其等效电路

表4 不同Al2O3包覆量富锂正极材料等效电路的阻抗

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